Malicious PDF — malware analysis report

Static analysis result for SHA-256 77cfc48c4cb3cd7e…

MALICIOUS

PDF

84.8 KB Created: 2021-09-07 00:11:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5fb4d278f7c35dc6a3518b968c09e34a SHA-1: 3740d7e059330adc88e839f4acea7eea3910bf17 SHA-256: 77cfc48c4cb3cd7ec16a0b71115f5eb49f1ad3eba601c2e2685bbd0096855939
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be part of a link farm. Heuristics indicate these links are used for SEO manipulation or potentially to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://synerhu.ru/uplcv?utm_term=manual+camera+minolta+srt+101 PDF link annotation
    • https://bilalyapidekorasyon.com/userfiles/file/somawexedosulesezigox.pdfIn PDF document text
    • http://100gastro.cz/soubory/files/beturop.pdfIn PDF document text
    • http://trendybiz.in/usersfiles/file/pigibufomaruxijamotote.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud//files/mifugalesefenive.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/6448114797.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/bavodevadad.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/38888425505.pdfIn PDF document text
    • https://sakkestadbil.no/userfiles/file/salisokilategu.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/1q5p78roi9dubjrohj7r6lghm9/sefoki.pdfIn PDF document text
    • http://wtmongolia.com/materials/file/30571230220.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/19595919380.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/lilujemobewegolelogipi.pdfIn PDF document text
    • http://brianhaymore.com/images/e/file/gapuwelabidojejigi.pdfIn PDF document text
    • http://language-coach.pl/uploads/files/woxofizalerorowisigoduta.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606dcfd97dea9---32727901631.pdfIn PDF document text
    • http://cctsw.net/whly/up_files/FCK/file/20210727_193134_166.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/87fb9bc60efd700279b234757bef3580/juxosetopubolokiteg.pdfIn PDF document text
    • http://dwallacelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/55144779268.pdfIn PDF document text
    • http://ladna.pl/user_images/file/tepiwezovevusitidodex.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da4efd8b71---daruzakagite.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/14279599566.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/retajexufimerusibasi.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/seganowifu.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aad16727fbb---dupigasa.pdfIn PDF document text
    • http://wmhsclassof1977.com/clients/34196/File/47096002397.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/21425466292.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/89a6610e917db2a29b56c4a3c3bf7148/41797757069.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/d06cba46bd60d57052777f8d5875c3d4/venatugakumonowunebamoxij.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F1 10656 bytes
SHA-256: 4ee58e8cfaecb7e7608ddfc9d6cc0272f2de6e4f0bc92da4ab6942396fe9db82
font_01_sfnt_off0000ff64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11776 18020 bytes
SHA-256: 5d4067eba79dc36446026bf8e7144955ac258f8704cd7d68634019c0461ac1ff

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